Method and apparatus for making a nonwoven fibrous electret...

Details Method and apparatus for making a nonwoven fibrous electret... Method and apparatus for making a nonwoven fibrous electret...

D - Textiles, Paper

04

H

D04H 1/42 (2006.01) B05D 1/02 (2006.01)

Patent

CA 2385788

A method and apparatus for charging fibers that contain a nonconductive polymer. A polar liquid (32, 34) is sprayed onto free-fibers (24), and the free-fibers (24) are then collected to form an entangled nonwoven fibrous web (25) that may contain a portion of the polar liquid. The nonwoven web (25) is then dried (38). By applying an effective amount of polar liquid (32, 34) onto the nonconductive free-fibers (24) before forming the nonwoven web (25), followed by drying (38), the individual fibers (24) become charged. The method and apparatus enable the fibers (24) to be charged during web manufacture without subsequent processing.

L'invention porte sur un procédé et un appareil permettant de charger des fibres qui contiennent un polymère non conducteur. Un liquide polaire (32, 34) est pulvérisé sur des fibres (24) non conductrices qui sont ensuite rassemblées de façon à former une bande (25) de fibres non tissées, enchevêtrées qui peuvent contenir une partie du liquide polaire. La bande (25) non tissée est ensuite séchée (38). En appliquant une quantité effective d'un liquide polaire (32, 34) sur les fibres (24) non conductrices avant de former la bande (25) non tissée, et après séchage (38), les fibres (24) individuelles se chargent électriquement. Ce procédé et cet appareil permettent de charger électriquement les fibres (24) lors de la fabrication de la bande sans traitement ultérieur.

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